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집 > php教程 > php手册 > yii2源码学习笔记(八），yii2源码学习笔记

yii2源码学习笔记(八），yii2源码学习笔记

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풀어 주다： 2016-06-13 08:38:51
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1228명이 탐색했습니다.

yii2源码学习笔记(八），yii2源码学习笔记

Action是所有控制器的基类，接下来了解一下它的源码。yii2\base\Action.php

<span>  1</span> <?<span>php
</span><span>  2</span> <span>/*</span><span>*
</span><span>  3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span>  4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span>  5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span>  6</span>  <span>*/</span>
<span>  7</span> 
<span>  8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span>  9</span> 
<span> 10</span> <span>use Yii;
</span><span> 11</span> 
<span> 12</span> <span>/*</span><span>*
</span><span> 13</span> <span> * Action is the base class for all controller action classes.
</span><span> 14</span> <span> * 是所有控制器的基类
</span><span> 15</span> <span> * Action provides a way to divide a complex controller into
</span><span> 16</span> <span> * smaller actions in separate class files.
</span><span> 17</span> <span> * 控制器提供了一种重复使用操作方法的代码，在多个控制器或不同的项目中使用
</span><span> 18</span> <span> * Derived classes must implement a method named `run()`. This method
</span><span> 19</span> <span> * will be invoked by the controller when the action is requested.
</span><span> 20</span> <span> * The `run()` method can have parameters which will be filled up
</span><span> 21</span> <span> * with user input values automatically according to their names.
</span><span> 22</span> <span> * 派生类必须实现一个名为run()的方法，这个方法会在控制器被请求时调用。
</span><span> 23</span> <span> * 它可以有参数，将用户输入值的根据他们的名字自动填补。
</span><span> 24</span> <span> * For example, if the `run()` method is declared as follows:
</span><span> 25</span> <span> * 例：run()方法调用声明如下：
</span><span> 26</span> <span> * ~~~
</span><span> 27</span> <span> * public function run($id, $type = 'book') { ... }
</span><span> 28</span> <span> * ~~~
</span><span> 29</span> <span> *
</span><span> 30</span> <span> * And the parameters provided for the action are: `['id' => 1]`.
</span><span> 31</span> <span> * Then the `run()` method will be invoked as `run(1)` automatically.
</span><span> 32</span> <span> * 并且提供了操作的参数 ['id'=>1];
</span><span> 33</span> <span> * 当run(1)时自动调用run();
</span><span> 34</span> <span> * @property string $uniqueId The unique ID of this action among the whole application. This property is
</span><span> 35</span> <span> * read-only.
</span><span> 36</span> <span> * 整个应用程序中，这一行动的唯一标识。此属性是只读
</span><span> 37</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span> 38</span> <span> * @since 2.0
</span><span> 39</span>  <span>*/</span>
<span> 40</span> <span>class</span><span> Action extends Component
</span><span> 41</span> <span>{
</span><span> 42</span>     <span>/*</span><span>*
</span><span> 43</span> <span>     * @var string ID of the action     ID的动作
</span><span> 44</span>      <span>*/</span>
<span> 45</span>     <span>public</span><span> $id;
</span><span> 46</span>     <span>/*</span><span>*
</span><span> 47</span> <span>     * @var Controller|\yii\web\Controller the controller that owns this action
</span><span> 48</span> <span>     * 拥有这一行动的控制器
</span><span> 49</span>      <span>*/</span>
<span> 50</span>     <span>public</span><span> $controller;
</span><span> 51</span> 
<span> 52</span> 
<span> 53</span>     <span>/*</span><span>*
</span><span> 54</span> <span>     * Constructor.
</span><span> 55</span> <span>     * 构造函数
</span><span> 56</span> <span>     * @param string $id the ID of this action  这一行动的ID
</span><span> 57</span> <span>     * @param Controller $controller the controller that owns this action 拥有这一行动的控制器
</span><span> 58</span> <span>     * @param array $config name-value pairs that will be used to initialize the object properties
</span><span> 59</span> <span>     * 用来初始化对象属性的 name-value 
</span><span> 60</span>      <span>*/</span>
<span> 61</span>     <span>public</span> function __construct($id, $controller, $config =<span> [])
</span><span> 62</span> <span>    {
</span><span> 63</span>         $<span>this</span>->id =<span> $id;
</span><span> 64</span>         $<span>this</span>->controller =<span> $controller;
</span><span> 65</span>         <span>//</span><span>调用父类的__construct()方法</span>
<span> 66</span> <span>        parent::__construct($config);
</span><span> 67</span> <span>    }
</span><span> 68</span> 
<span> 69</span>     <span>/*</span><span>*
</span><span> 70</span> <span>     * Returns the unique ID of this action among the whole application.
</span><span> 71</span> <span>     * 返回整个应用程序中的唯一ID。
</span><span> 72</span> <span>     * @return string the unique ID of this action among the whole application.
</span><span> 73</span> <span>     * 在整个应用程序中，这一行动的唯一ID。
</span><span> 74</span>      <span>*/</span>
<span> 75</span>     <span>public</span><span> function getUniqueId()
</span><span> 76</span> <span>    {
</span><span> 77</span>         <span>return</span> $<span>this</span>->controller->getUniqueId() . <span>'</span><span>/</span><span>'</span> . $<span>this</span>-><span>id;
</span><span> 78</span> <span>    }
</span><span> 79</span> 
<span> 80</span>     <span>/*</span><span>*
</span><span> 81</span> <span>     * Runs this action with the specified parameters.  用指定的参数运行此操作。
</span><span> 82</span> <span>     * This method is mainly invoked by the controller. 该方法主要由控制器调用。
</span><span> 83</span> <span>     *
</span><span> 84</span> <span>     * @param array $params the parameters to be bound to the action's run() method.绑定到行动的run()方法的参数。
</span><span> 85</span> <span>     * @return mixed the result of the action   行动的结果  命名参数是否有效的
</span><span> 86</span> <span>     * @throws InvalidConfigException if the action class does not have a run() method
</span><span> 87</span> <span>     * 如果动作类没有run()方法 扔出异常
</span><span> 88</span>      <span>*/</span>
<span> 89</span>     <span>public</span> function runWithParams($<span>params</span><span>)
</span><span> 90</span> <span>    {
</span><span> 91</span>         <span>if</span> (!method_exists($<span>this</span>, <span>'</span><span>run</span><span>'</span>)) {<span>//</span><span>如果动作类没有run()方法 抛出异常</span>
<span> 92</span>             <span>throw</span> <span>new</span> InvalidConfigException(get_class($<span>this</span>) . <span>'</span><span> must define a "run()" method.</span><span>'</span><span>);
</span><span> 93</span> <span>        }
</span><span> 94</span>         <span>//</span><span>调用bindActionParams()方法将参数绑定到动作。</span>
<span> 95</span>         $args = $<span>this</span>->controller->bindActionParams($<span>this</span>, $<span>params</span><span>);
</span><span> 96</span>         <span>//</span><span>记录跟踪消息</span>
<span> 97</span>         Yii::trace(<span>'</span><span>Running action: </span><span>'</span> . get_class($<span>this</span>) . <span>'</span><span>::run()</span><span>'</span><span>, __METHOD__);
</span><span> 98</span>         <span>if</span> (Yii::$app->requestedParams === <span>null</span><span>) {
</span><span> 99</span>             <span>//</span><span>请求的动作提供的参数</span>
<span>100</span>             Yii::$app->requestedParams =<span> $args;
</span><span>101</span> <span>        }
</span><span>102</span>         <span>if</span> ($<span>this</span>-><span>beforeRun()) {
</span><span>103</span>             <span>//</span><span>执行run()方法</span>
<span>104</span>             $result = call_user_func_array([$<span>this</span>, <span>'</span><span>run</span><span>'</span><span>], $args);
</span><span>105</span>             $<span>this</span>-><span>afterRun();
</span><span>106</span> 
<span>107</span>             <span>return</span><span> $result;
</span><span>108</span>         } <span>else</span><span> {
</span><span>109</span>             <span>return</span> <span>null</span><span>;
</span><span>110</span> <span>        }
</span><span>111</span> <span>    }
</span><span>112</span> 
<span>113</span>     <span>/*</span><span>*
</span><span>114</span> <span>     * This method is called right before `run()` is executed.
</span><span>115</span> <span>     * ` run() `执行前方法被调用。
</span><span>116</span> <span>     * You may override this method to do preparation work for the action run.
</span><span>117</span> <span>     * 可以重写此方法，为该操作运行的准备工作。
</span><span>118</span> <span>     * If the method returns false, it will cancel the action.
</span><span>119</span> <span>     * 如果该方法返回false，取消该操作。
</span><span>120</span> <span>     * @return boolean whether to run the action.
</span><span>121</span>      <span>*/</span>
<span>122</span>     <span>protected</span><span> function beforeRun()
</span><span>123</span> <span>    {
</span><span>124</span>         <span>return</span> <span>true</span><span>;
</span><span>125</span> <span>    }
</span><span>126</span> 
<span>127</span>     <span>/*</span><span>*
</span><span>128</span> <span>     * This method is called right after `run()` is executed.       ` run() `执行后 方法被调用。
</span><span>129</span> <span>     * You may override this method to do post-processing work for the action run.
</span><span>130</span> <span>     * 可以重写此方法来处理该动作的后续处理工作。
</span><span>131</span>      <span>*/</span>
<span>132</span>     <span>protected</span><span> function afterRun()
</span><span>133</span> <span>    {
</span><span>134</span> <span>    }
</span><span>135</span> }
로그인 후 복사

接下来我们看一下事件参数相关重要的一个类ActionEvent。yii2\base\ActionEvent.php

<span> 1</span> <?<span>php
</span><span> 2</span> <span>/*</span><span>*
</span><span> 3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span> 4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span> 5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span> 6</span>  <span>*/</span>
<span> 7</span> 
<span> 8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span> 9</span> 
<span>10</span> <span>/*</span><span>*
</span><span>11</span> <span> * ActionEvent represents the event parameter used for an action event.
</span><span>12</span> <span> * 用于操作事件的事件参数
</span><span>13</span> <span> * By setting the [[isValid]] property, one may control whether to continue running the action.
</span><span>14</span> <span> * 通过设置[[isValid]]属性，控制是否继续运行action。
</span><span>15</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span>16</span> <span> * @since 2.0
</span><span>17</span>  <span>*/</span>
<span>18</span> <span>class</span><span> ActionEvent extends Event
</span><span>19</span> <span>{
</span><span>20</span>     <span>/*</span><span>*
</span><span>21</span> <span>     * @var Action the action currently being executed
</span><span>22</span> <span>     * 目前正在执行的行动
</span><span>23</span>      <span>*/</span>
<span>24</span>     <span>public</span><span> $action;
</span><span>25</span>     <span>/*</span><span>*
</span><span>26</span> <span>     * @var mixed the action result. Event handlers may modify this property to change the action result.
</span><span>27</span> <span>     * 操作结果 事件处理程序可以修改此属性来更改操作结果。
</span><span>28</span>      <span>*/</span>
<span>29</span>     <span>public</span><span> $result;
</span><span>30</span>     <span>/*</span><span>*
</span><span>31</span> <span>     * @var boolean whether to continue running the action. Event handlers of
</span><span>32</span> <span>     * [[Controller::EVENT_BEFORE_ACTION]] may set this property to decide whether
</span><span>33</span> <span>     * to continue running the current action.
</span><span>34</span> <span>     * 是否继续运行该动作。设置[[Controller::EVENT_BEFORE_ACTION]]属性决定是否执行当前的操作
</span><span>35</span>      <span>*/</span>
<span>36</span>     <span>public</span> $isValid = <span>true</span><span>;
</span><span>37</span> 
<span>38</span> 
<span>39</span>     <span>/*</span><span>*
</span><span>40</span> <span>     * Constructor.构造函数。
</span><span>41</span> <span>     * @param Action $action the action associated with this action event.与此事件相关联的动作。
</span><span>42</span> <span>     * @param array $config name-value pairs that will be used to initialize the object properties
</span><span>43</span> <span>     * 用来初始化对象属性的 name-value
</span><span>44</span>      <span>*/</span>
<span>45</span>     <span>public</span> function __construct($action, $config =<span> [])
</span><span>46</span> <span>    {
</span><span>47</span>         $<span>this</span>->action =<span> $action;
</span><span>48</span> <span>        parent::__construct($config);
</span><span>49</span> <span>    }
</span><span>50</span> }
로그인 후 복사

今天最后看一下操作过滤器的基类吧ActionFilter。yii2\base\ActionFilter.php。

<span>  1</span> <?<span>php
</span><span>  2</span> <span>/*</span><span>*
</span><span>  3</span> <span> * @link </span><span>http://www.yiiframework.com/</span>
<span>  4</span> <span> * @copyright Copyright (c) 2008 Yii Software LLC
</span><span>  5</span> <span> * @license </span><span>http://www.yiiframework.com/license/</span>
<span>  6</span>  <span>*/</span>
<span>  7</span> 
<span>  8</span> <span>namespace</span> yii\<span>base</span><span>;
</span><span>  9</span> 
<span> 10</span> <span>/*</span><span>*
</span><span> 11</span> <span> * ActionFilter is the base class for action filters.
</span><span> 12</span> <span> * 是操作过滤器的基类。
</span><span> 13</span> <span> * An action filter will participate in the action execution workflow by responding to
</span><span> 14</span> <span> * the `beforeAction` and `afterAction` events triggered by modules and controllers.
</span><span> 15</span> <span> * 一个操作过滤器将参与行动的执行工作流程，通过触发模型和控制器的`beforeAction` 和`afterAction` 事件
</span><span> 16</span> <span> * Check implementation of [[\yii\filters\AccessControl]], [[\yii\filters\PageCache]] and [[\yii\filters\HttpCache]] as examples on how to use it.
</span><span> 17</span> <span> * 
</span><span> 18</span> <span> * @author Qiang Xue <qiang.xue@gmail.com>
</span><span> 19</span> <span> * @since 2.0
</span><span> 20</span>  <span>*/</span>
<span> 21</span> <span>class</span><span> ActionFilter extends Behavior
</span><span> 22</span> <span>{
</span><span> 23</span>     <span>/*</span><span>*
</span><span> 24</span> <span>     * @var array list of action IDs that this filter should apply to. If this property is not set,
</span><span> 25</span> <span>     * then the filter applies to all actions, unless they are listed in [[except]].
</span><span> 26</span> <span>     * 操作标识列表。如果该属性未设置，过滤器适用于所有的行动，除非它们被列入[[except]]中。
</span><span> 27</span> <span>     * If an action ID appears in both [[only]] and [[except]], this filter will NOT apply to it.
</span><span> 28</span> <span>     * 如果一个操作ID 出现在[[only]] 和[[except]]中，该筛选器将不适用它
</span><span> 29</span> <span>     * Note that if the filter is attached to a module, the action IDs should also include child module IDs (if any)
</span><span> 30</span> <span>     * and controller IDs.
</span><span> 31</span> <span>     * 如果过滤器是链接到一个模块，操作检测还应包括子模块和控制器
</span><span> 32</span> <span>     *
</span><span> 33</span> <span>     * @see except
</span><span> 34</span>      <span>*/</span>
<span> 35</span>     <span>public</span><span> $only;
</span><span> 36</span>     <span>/*</span><span>*
</span><span> 37</span> <span>     * @var array list of action IDs that this filter should not apply to.
</span><span> 38</span> <span>     * 此筛选器不应适用于操作ID。
</span><span> 39</span> <span>     * @see only
</span><span> 40</span>      <span>*/</span>
<span> 41</span>     <span>public</span> $except =<span> [];
</span><span> 42</span> 
<span> 43</span> 
<span> 44</span>     <span>/*</span><span>*
</span><span> 45</span> <span>     * @inheritdoc
</span><span> 46</span> <span>     * 将行为对象附加到组件。
</span><span> 47</span>      <span>*/</span>
<span> 48</span>     <span>public</span><span> function attach($owner)
</span><span> 49</span> <span>    {
</span><span> 50</span>         $<span>this</span>->owner =<span> $owner;
</span><span> 51</span>         $owner->on(Controller::EVENT_BEFORE_ACTION, [$<span>this</span>, <span>'</span><span>beforeFilter</span><span>'</span><span>]);
</span><span> 52</span> <span>    }
</span><span> 53</span> 
<span> 54</span>     <span>/*</span><span>*
</span><span> 55</span> <span>     * @inheritdoc
</span><span> 56</span> <span>     * 将行为对象和组件分离。
</span><span> 57</span>      <span>*/</span>
<span> 58</span>     <span>public</span><span> function detach()
</span><span> 59</span> <span>    {
</span><span> 60</span>         <span>if</span> ($<span>this</span>-><span>owner) {
</span><span> 61</span>             $<span>this</span>->owner->off(Controller::EVENT_BEFORE_ACTION, [$<span>this</span>, <span>'</span><span>beforeFilter</span><span>'</span><span>]);
</span><span> 62</span>             $<span>this</span>->owner->off(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span><span>]);
</span><span> 63</span>             $<span>this</span>->owner = <span>null</span><span>;
</span><span> 64</span> <span>        }
</span><span> 65</span> <span>    }
</span><span> 66</span> 
<span> 67</span>     <span>/*</span><span>*
</span><span> 68</span> <span>     * @param ActionEvent $event    在动作之前调用
</span><span> 69</span>      <span>*/</span>
<span> 70</span>     <span>public</span> function beforeFilter($<span>event</span><span>)
</span><span> 71</span> <span>    {
</span><span> 72</span>         <span>if</span> (!$<span>this</span>->isActive($<span>event</span>-><span>action)) {
</span><span> 73</span>             <span>return</span><span>;
</span><span> 74</span> <span>        }
</span><span> 75</span> 
<span> 76</span>         $<span>event</span>->isValid = $<span>this</span>->beforeAction($<span>event</span>-><span>action);
</span><span> 77</span>         <span>if</span> ($<span>event</span>-><span>isValid) {
</span><span> 78</span>             <span>//</span><span> call afterFilter only if beforeFilter succeeds    beforeFilter 执行成功调用afterFilter
</span><span> 79</span>             <span>//</span><span> beforeFilter and afterFilter should be properly nested  两者要配合应用</span>
<span> 80</span>             $<span>this</span>->owner->on(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span>], <span>null</span>, <span>false</span><span>);
</span><span> 81</span>         } <span>else</span><span> {
</span><span> 82</span>             $<span>event</span>->handled = <span>true</span><span>;
</span><span> 83</span> <span>        }
</span><span> 84</span> <span>    }
</span><span> 85</span> 
<span> 86</span>     <span>/*</span><span>*
</span><span> 87</span> <span>     * @param ActionEvent $event
</span><span> 88</span>      <span>*/</span>
<span> 89</span>     <span>public</span> function afterFilter($<span>event</span><span>)
</span><span> 90</span> <span>    {
</span><span> 91</span>         $<span>event</span>->result = $<span>this</span>->afterAction($<span>event</span>->action, $<span>event</span>-><span>result);
</span><span> 92</span>         $<span>this</span>->owner->off(Controller::EVENT_AFTER_ACTION, [$<span>this</span>, <span>'</span><span>afterFilter</span><span>'</span><span>]);
</span><span> 93</span> <span>    }
</span><span> 94</span> 
<span> 95</span>     <span>/*</span><span>*
</span><span> 96</span> <span>     * This method is invoked right before an action is to be executed (after all possible filters.)
</span><span> 97</span> <span>     * 此方法是在一个动作之前被调用的（
</span><span> 98</span> <span>     * You may override this method to do last-minute preparation for the action.
</span><span> 99</span> <span>     * @param Action $action the action to be executed.要执行的动作
</span><span>100</span> <span>     * @return boolean whether the action should continue to be executed.
</span><span>101</span> <span>     * 是否应继续执行该动作。
</span><span>102</span>      <span>*/</span>
<span>103</span>     <span>public</span><span> function beforeAction($action)
</span><span>104</span> <span>    {
</span><span>105</span>         <span>return</span> <span>true</span><span>;
</span><span>106</span> <span>    }
</span><span>107</span> 
<span>108</span>     <span>/*</span><span>*
</span><span>109</span> <span>     * This method is invoked right after an action is executed.
</span><span>110</span> <span>     * 此方法是在执行动作之后调用的。
</span><span>111</span> <span>     * You may override this method to do some postprocessing for the action.
</span><span>112</span> <span>     * @param Action $action the action just executed.  刚刚执行的动作
</span><span>113</span> <span>     * @param mixed $result the action execution result 行动执行结果
</span><span>114</span> <span>     * @return mixed the processed action result.   处理结果。
</span><span>115</span>      <span>*/</span>
<span>116</span>     <span>public</span><span> function afterAction($action, $result)
</span><span>117</span> <span>    {
</span><span>118</span>         <span>return</span><span> $result;
</span><span>119</span> <span>    }
</span><span>120</span> 
<span>121</span>     <span>/*</span><span>*
</span><span>122</span> <span>     * Returns a value indicating whether the filer is active for the given action.
</span><span>123</span> <span>     * 返回一个值，给定的过滤器的行动是否为是积极的。
</span><span>124</span> <span>     * @param Action $action the action being filtered 被过滤的动作
</span><span>125</span> <span>     * @return boolean whether the filer is active for the given action.
</span><span>126</span> <span>     * 给定的过滤器的行动是否为是积极的。
</span><span>127</span>      <span>*/</span>
<span>128</span>     <span>protected</span><span> function isActive($action)
</span><span>129</span> <span>    {
</span><span>130</span>         <span>if</span> ($<span>this</span>-><span>owner instanceof Module) {
</span><span>131</span>             <span>//</span><span> convert action uniqueId into an ID relative to the module</span>
<span>132</span>             $mid = $<span>this</span>->owner-><span>getUniqueId();
</span><span>133</span>             $id = $action-><span>getUniqueId();
</span><span>134</span>             <span>if</span> ($mid !== <span>''</span> && strpos($id, $mid) === <span>0</span><span>) {
</span><span>135</span>                 $id = substr($id, strlen($mid) + <span>1</span><span>);
</span><span>136</span> <span>            }
</span><span>137</span>         } <span>else</span><span> {
</span><span>138</span>             $id = $action-><span>id;
</span><span>139</span> <span>        }
</span><span>140</span>         <span>return</span> !in_array($id, $<span>this</span>->except, <span>true</span>) && (empty($<span>this</span>->only) || in_array($id, $<span>this</span>->only, <span>true</span><span>));
</span><span>141</span> <span>    }
</span><span>142</span> }
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